
export default {
  // 为当前模块开启命名空间
  namespaced: true,

  // 模块的 state 数据
  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
    // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart: JSON.parse(uni.getStorageSync('cart')||'[]')
  }),

  // 模块的 mutations 方法
  mutations: {
    addToCart(state,goods){
      const findResult = state.cart.find((x)=>x.goods_id===goods.goods_id)
      if(!findResult){
        state.cart.push(goods)
      } else {
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state,goods){
    const findResult =  state.cart.find(item=>item.goods_id === goods.goods_id)
    findResult.goods_state = goods.goods_state
      this.commit('m_cart/saveToStorage')
    },
    updateGoodsCount(state,goods){
      const findResult =  state.cart.find(item=>item.goods_id === goods.goods_id)
      findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStorage')
    },
    removeGoodsById(state,goods_id){
     state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
      this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state,status){
      state.cart.forEach(x=>x.goods_state=status)
       this.commit('m_cart/saveToStorage')
    }
  },

  // 模块的 getters 属性
  getters: {
    total(state){
      // let c = 0
      // // 循环统计商品的数量，累加到变量 c 中
      // state.cart.forEach(goods => c += goods.goods_count)
      // return c
     return  state.cart.reduce((p,c)=>p+c.goods_count,0)
    },
    checkedCount(state){
     return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count * item.goods_price, 0).toFixed(2)
    }
  },
}